CN103773379A

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Info

Publication number: CN103773379A
Application number: CN201410032709.XA
Authority: CN
Inventors: 杨洁; 高洁; 朱江; 王旌; 张长波; 罗启仕
Original assignee: Shanghai Academy of Environmental Sciences
Current assignee: Shanghai Academy of Environmental Sciences
Priority date: 2014-01-23
Filing date: 2014-01-23
Publication date: 2014-05-07

Abstract

本发明公开了一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂及其使用方法。该稳定剂包括重金属螯合剂5-10%、胶凝材料10-20%、改性粘土矿物55-65%、碱性激发剂10-15%；其中改性粘土矿物由十六烷基三甲基溴化铵和十二烷基硫酸钠按体积比1:0.8-1:1.2混合，再以质量比5-10%加入到粘土矿物中制得。使用方法为：将胶凝材料、改性粘土矿物、碱性激发剂混合后研磨至勃氏比表面积5000-8000cm²/g，过200目筛，含水率小于3%，按质量比10-20%直接添加至重金属污染土壤中并混合搅拌；将重金属螯合剂配制成10-20%的溶液后喷洒在重金属污染土壤中并混合搅拌。本发明的稳定剂不使用传统的水泥类组分，处理后污染物的浸出毒性明显下降，使用后土壤中的重金属和半挥发性有机污染物可以快速的稳定化。The invention discloses a stabilizer suitable for compound polluted soil of heavy metals and semi-volatile organic compounds and a use method thereof. The stabilizer includes 5-10% of heavy metal chelating agent, 10-20% of gelling material, 55-65% of modified clay mineral, and 10-15% of alkaline activator; wherein the modified clay mineral is composed of cetyl trimethyl Ammonium bromide and sodium lauryl sulfate are mixed at a volume ratio of 1:0.8-1:1.2, and then added to clay minerals at a mass ratio of 5-10%. The method of use is: mix the gelling material, modified clay mineral, and alkaline activator, and then grind until the Blaine specific surface area is 5000-8000cm² /g, pass through a 200-mesh sieve, and the water content is less than 3%, according to the mass ratio of 10-20 % directly added to the heavy metal polluted soil and mixed; after the heavy metal chelating agent was formulated into a 10-20% solution, it was sprayed on the heavy metal polluted soil and mixed. The stabilizer of the invention does not use traditional cement components, the leaching toxicity of the pollutants after treatment is obviously reduced, and the heavy metals and semi-volatile organic pollutants in the soil can be rapidly stabilized after use.

Description

Translated fromChinese

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂及其使用方法A kind of stabilizer suitable for heavy metal and semi-volatile organic compound compound polluted soil and its application method

技术领域technical field

本发明属于污染土壤修复治理技术领域，涉及一种适用于重金属和半挥发性有机物复合污染土壤快速修复治理的稳定剂及其使用方法。 The invention belongs to the technical field of remediation and treatment of polluted soil, and relates to a stabilizer suitable for rapid remediation and treatment of compound polluted soil with heavy metals and semi-volatile organic compounds and a use method thereof. the

背景技术Background technique

近年来，我国工业企业对土壤环境造成的污染逐渐显现，污染物主要有重金属、挥发性和半挥发性有机物。如何有效的实施污染土壤治理修复，保障人民群众健康安全，已成为当前全社会关注的热点。 In recent years, the pollution of the soil environment caused by my country's industrial enterprises has gradually emerged. The pollutants mainly include heavy metals, volatile and semi-volatile organic compounds. How to effectively implement the remediation of contaminated soil and ensure the health and safety of the people has become a hot spot of concern to the whole society. the

稳定化技术是一种较为成熟且经济有效的技术，在降低重金属和部分半挥发性有机物的环境风险方面具有良好的效果。该技术利用稳定剂与土壤及其中的污染物发生螯合、沉淀、吸附等物理化学作用，通过降低土壤中污染物的迁移性，从而达到修复治理的目的。迄今为止，在欧美及其他发达国家稳定化技术已经在污染土壤修复项目中得到广泛的应用。 Stabilization technology is a relatively mature and cost-effective technology, which has a good effect in reducing the environmental risks of heavy metals and some semi-volatile organic compounds. This technology utilizes physical and chemical effects such as chelation, precipitation, and adsorption between the stabilizer and the soil and its pollutants, and reduces the mobility of pollutants in the soil, thereby achieving the purpose of restoration and treatment. So far, stabilization technology has been widely used in contaminated soil remediation projects in Europe, America and other developed countries. the

目前，针对含重金属类污染土壤的稳定化技术已经较为成熟，而应用于重金属与半挥发性有机物复合污染土壤的稳定剂却很少。与重金属相比，半挥发性有机物种类繁多，物理化学特性更为复杂，总体上固定包容难度大，与重金属形成复合污染土壤时治理难度增大，因此，复合污染土壤的稳定化技术具有许多不同于单含重金属类污染土壤稳定化技术的特点，适用于重金属类污染土壤的稳定剂并不能用在重金属与半挥发性有机物复合污染土壤的修复上，因其对半挥发性有机物的修复效果不好。 At present, the stabilization technology for heavy metal-contaminated soil is relatively mature, but there are few stabilizers for heavy metal-semivolatile organic compound-contaminated soil. Compared with heavy metals, there are many types of semi-volatile organic compounds, and their physical and chemical properties are more complex. Generally speaking, it is difficult to fix and contain them. When they form composite polluted soil with heavy metals, it is more difficult to treat them. Therefore, there are many different stabilization technologies for composite polluted soil. Due to the characteristics of the stabilization technology for soil contaminated with heavy metals alone, the stabilizer suitable for heavy metal-contaminated soil cannot be used in the remediation of soil contaminated with heavy metals and semi-volatile organic compounds, because the remediation effect on semi-volatile organic compounds is not good. good. the

目前国内针对复合污染土壤的稳定剂专利相对较少，并主要集中于采用含水泥、石灰等无机胶结剂的专利。含有水泥类成分的修复药剂在添加到土壤后，会导致修复后土壤硬化、增容，而且单纯使用水泥或石灰等无机胶结剂，依靠水化反应形成的C-S-H和粘土矿物的吸附作用，不仅无法对有机物进行充分有效地固定，同时对土壤中重金属的固定效果容易受外界环境条件的影响。有机物对于无机胶结剂的胶结过程有干扰作用，如何选择合适的添加剂以实现对复合污染土壤快速、有效的处理成为该技术应用的瓶颈。 At present, domestically, there are relatively few stabilizer patents for complex polluted soils, and they mainly focus on patents using inorganic binders such as cement and lime. Restoration agents containing cement components will harden and increase the volume of the repaired soil after being added to the soil, and the simple use of cement or lime and other inorganic binders, relying on the adsorption of C-S-H formed by hydration reactions and clay minerals, not only cannot It can fully and effectively fix organic matter, and at the same time, the fixation effect on heavy metals in soil is easily affected by external environmental conditions. Organic matter interferes with the cementation process of inorganic binders, and how to select appropriate additives to achieve rapid and effective treatment of compound polluted soils has become a bottleneck in the application of this technology. the

发明内容Contents of the invention

本发明的目的在于克服现有技术的不足，提供一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂及其使用方法，该稳定剂不使用传统的水泥类组分，处理后污染物的浸出毒性明显下降。 The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a kind of stabilizer suitable for heavy metal and semi-volatile organic compounds compound polluted soil and its application method, the stabilizer does not use traditional cement components, the pollutants after treatment The leaching toxicity was significantly reduced. the

本发明的技术方案如下： Technical scheme of the present invention is as follows:

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂，该稳定剂包含下列质量比的组分：重金属螯合剂5%～10%、胶凝材料10%～20%、改性粘土矿物55%～65%、碱性激发剂10%～15%，其原料总和为100%；上述组分中的胶凝材料、改性粘土矿物、碱性激发剂经混合后研磨至勃氏比表面积5000～8000cm²/g，过200目筛，含水率小于3%；占原料总和50%～65%的改性粘土矿物需单独制备。 A stabilizer suitable for heavy metal and semi-volatile organic compound polluted soil, the stabilizer contains the following components in mass ratio: heavy metal chelating agent 5% to 10%, cementitious material 10% to 20%, modified clay mineral 55% to 65%, basic activator 10% to 15%, the sum of its raw materials is 100%; the gelling material, modified clay mineral, and basic activator in the above components are mixed and ground to Blaine specific surface area 5000～8000cm² /g, passed through a 200 mesh sieve, and the moisture content is less than 3%; the modified clay minerals accounting for 50%～65% of the total raw materials need to be prepared separately.

所述的改性粘土矿物按照如下方法制备得到： Described modified clay mineral is prepared according to the following method:

配制十六烷基三甲基溴化铵（CTMAB，一种季铵阳离子表面活性剂）和十二烷基硫酸钠（SDS，一种阴离子表面活性剂）的混合溶液，v/v=1:0.8～1:1.2，以质量比5%～10%加入到粘土矿物中，在40℃～50℃下震荡8h～10h后，过滤，洗涤，再过滤，于85℃～90℃下干燥48h～72h，研磨，过200目筛。 Prepare a mixed solution of cetyltrimethylammonium bromide (CTMAB, a quaternary ammonium cationic surfactant) and sodium dodecyl sulfate (SDS, an anionic surfactant), v/v=1: 0.8～1:1.2, add to clay minerals at a mass ratio of 5%～10%, shake at 40℃～50℃ for 8h～10h, filter, wash, filter again, and dry at 85℃～90℃ for 48h～ 72h, grind, and pass through a 200-mesh sieve. the

所述粘土矿物为沸石、蛭石、坡缕石、蒙脱石、高岭土中的一种或多种复合。 The clay mineral is one or more composites of zeolite, vermiculite, palygorskite, montmorillonite and kaolin. the

所述稳定剂中的重金属螯合剂为EDTA、硫化亚铁、三嗪三钠盐中的一种或多种复合。 The heavy metal chelating agent in the stabilizer is one or more composites of EDTA, ferrous sulfide, trisodium triazine. the

所述稳定剂中的胶凝材料为硅酸盐、硅铝酸盐、铁铝酸盐中的一种或多种复合。 The gelling material in the stabilizer is one or more composites of silicates, aluminosilicates, and aluminosilicates. the

所述稳定剂中的碱性激发剂为硫酸钠。 The alkaline activator in the stabilizer is sodium sulfate. the

上述适用于重金属和半挥发性有机物复合污染土壤的稳定剂的使用方法如下： The above-mentioned stabilizers applicable to heavy metal and semi-volatile organic compound-contaminated soils are used as follows:

所述稳定剂中的胶凝材料、改性粘土矿物、碱性激发剂混合使用，使用方法为：将所述稳定剂中的胶凝材料、改性粘土矿物、碱性激发剂混合后研磨至勃氏比表面积5000～8000cm²/g，过200目筛，含水率小于3%；然后将混合研磨后的产品直接添加至重金属污染土壤中并混合搅拌，添加比例为土壤质量的10%～20%； The gelling material in the stabilizer, the modified clay mineral, and the basic activator are mixed and used, and the method of use is: the gelling material in the stabilizer, the modified clay mineral, and the basic activator are mixed and then ground to Blaine's specific surface area is 5000-8000cm² /g, passed through a 200-mesh sieve, and the moisture content is less than 3%; then the mixed and ground product is directly added to the heavy metal-contaminated soil and mixed, and the addition ratio is 10%-20% of the soil mass. %;

所述稳定剂中占原料总和5%～10%的重金属螯合剂单独使用，使用方法为：将所述稳定剂中的重金属螯合剂配制成质量百分浓度为10%～20%的溶液，然后将配制的重金属螯合剂溶液直接喷洒在重金属污染土壤中并混合搅拌。 The heavy metal chelating agent accounting for 5% to 10% of the total amount of raw materials in the stabilizer is used alone, and the method of use is: the heavy metal chelating agent in the stabilizer is formulated into a solution with a concentration of 10% to 20% by mass, and then The prepared heavy metal chelating agent solution is directly sprayed on the heavy metal polluted soil and mixed. the

本发明的有益效果是： The beneficial effects of the present invention are:

本发明采用的稳定剂中的主要成分多为天然材料，通过螯合、络合、沉淀、吸附等复合作用，在短时间内实现重金属和半挥发性有机污染物的长期稳定，削弱其污染土壤的生态风险，降低污染物的毒性和生物有效性，以达到短时间内修复受污染土壤的目的，使用后土壤中的重金属和半挥发性有机污染物可以快速的稳定化。采用的材料廉价易得，且不会产生二次污染，7天后即可达到较为理想和稳定的状态，是一种快速高效的稳定固化技术。 The main components of the stabilizer used in the present invention are mostly natural materials, through complex effects such as chelation, complexation, precipitation, adsorption, etc., to achieve long-term stability of heavy metals and semi-volatile organic pollutants in a short period of time, and weaken their polluted soil Ecological risks, reduce the toxicity and bioavailability of pollutants, in order to achieve the purpose of repairing polluted soil in a short time, the heavy metals and semi-volatile organic pollutants in the soil can be quickly stabilized after use. The materials used are cheap and easy to obtain, and will not cause secondary pollution. It can reach an ideal and stable state after 7 days. It is a fast, efficient and stable curing technology. the

具体实施方式Detailed ways

下面结合实施例对本发明作进一步详细的说明： Below in conjunction with embodiment the present invention is described in further detail:

实施例1 Example 1

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂，该稳定剂包含下列质量比的组分：重金属螯合剂EDTA5%、胶凝材料硅酸盐20%、改性粘土矿物65%、碱性激发剂硫酸钠10%，其原料总和为100%； A stabilizer suitable for heavy metal and semi-volatile organic compound polluted soil, the stabilizer contains the following components in mass ratio: heavy metal chelating agent EDTA5%, cementitious material silicate 20%, modified clay mineral 65%, Alkaline activator sodium sulfate 10%, the sum of its raw materials is 100%;

所述改性粘土矿物按如下方法制备得到：按体积比1:0.8配制十六烷基三甲基溴化铵和十二烷基硫酸钠的混合溶液，以质量比5%加入到粘土矿物沸石中，在50℃下震荡8h后，过滤，洗涤，再过滤，于85℃下干燥60h，研磨，过200目筛。 The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:0.8, and add it to the clay mineral zeolite with a mass ratio of 5%. After shaking at 50°C for 8h, filter, wash, filter again, dry at 85°C for 60h, grind, and pass through a 200-mesh sieve. the

实施例2 Example 2

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂，该稳定剂包含下列质量比的组分：重金属螯合剂EDTA与硫化亚铁的1:1复配物10%、胶凝材料硅铝酸盐20%、改性粘土矿物55%、碱性激发剂硫酸钠15%，其原料总和为 100%； A stabilizer suitable for heavy metal and semi-volatile organic compounds compound polluted soil, the stabilizer comprises the following components in mass ratio: 10% of the 1:1 compound of heavy metal chelating agent EDTA and ferrous sulfide, gelling material silicon Aluminate 20%, modified clay mineral 55%, alkaline activator sodium sulfate 15%, the sum of the raw materials is 100%;

所述改性粘土矿物按如下方法制备得到：按体积比1:1.2配制十六烷基三甲基溴化铵和十二烷基硫酸钠的混合溶液，以质量比10%加入到粘土矿物蛭石中，在40℃下震荡10h后，过滤，洗涤，再过滤，于90℃下干燥48h，研磨，过200目筛。 The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:1.2, and add it to the clay mineral leech with a mass ratio of 10%. After shaking at 40°C for 10h, filter, wash, filter again, dry at 90°C for 48h, grind, and pass through a 200-mesh sieve. the

实施例3 Example 3

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂，该稳定剂包含下列质量比的组分：重金属螯合剂硫化亚铁8%、胶凝材料硅酸盐与硅铝酸盐的1:1复配物18%、改性粘土矿物62%、碱性激发剂硫酸钠12%，其原料总和为100%； A stabilizer suitable for heavy metal and semi-volatile organic compounds compound polluted soil, the stabilizer comprises the following components in mass ratio: 8% of heavy metal chelating agent ferrous sulfide, 1% of cementitious material silicate and aluminosilicate : 1 compound 18%, modified clay mineral 62%, alkaline activator sodium sulfate 12%, the sum of its raw materials is 100%;

所述改性粘土矿物按如下方法制备得到：按体积比1:1.1配制十六烷基三甲基溴化铵和十二烷基硫酸钠的混合溶液，以质量比7%加入到粘土矿物高岭土中，在45℃下震荡9h后，过滤，洗涤，再过滤，于88℃下干燥48h，研磨，过200目筛。 The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:1.1, and add it to the clay mineral kaolin with a mass ratio of 7%. After shaking at 45°C for 9h, filter, wash, filter again, dry at 88°C for 48h, grind, and pass through a 200-mesh sieve. the

实施例4 Example 4

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂，该稳定剂包含下列质量比的组分：重金属螯合剂EDTA10%、胶凝材料硅铝酸盐15%、改性粘土矿物60%、碱性激发剂硫酸钠15%，其原料总和为100%； A stabilizer suitable for heavy metal and semi-volatile organic compound polluted soil, the stabilizer contains the following components in mass ratio: heavy metal chelating agent EDTA10%, cementitious material aluminosilicate 15%, modified clay mineral 60% 15% of alkaline activator sodium sulfate, the sum of its raw materials is 100%;

所述改性粘土矿物按如下方法制备得到：按体积比1:1配制十六烷基三甲基溴化铵和十二烷基硫酸钠的混合溶液，以质量比8%加入到粘土矿物沸石与蒙脱石的1:1复配物中，在45℃下震荡8h后，过滤，洗涤，再过滤，于85℃下干燥60h，研磨，过200目筛。 The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:1, and add it to the clay mineral zeolite with a mass ratio of 8%. In the 1:1 compound with montmorillonite, shake at 45°C for 8h, filter, wash, filter again, dry at 85°C for 60h, grind, and pass through a 200-mesh sieve. the

实施例5 Example 5

一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂，该稳定剂包含下列质量比的组分：重金属螯合剂三嗪三钠盐10%、胶凝材料铁铝酸盐10%、改性粘土矿物65%、碱性激发剂硫酸钠15%，其原料总和为100%； A stabilizer suitable for heavy metal and semi-volatile organic compound polluted soil, the stabilizer comprises the following components in mass ratio: heavy metal chelating agent triazine trisodium salt 10%, cementitious material ferric aluminate 10%, improved Active clay mineral 65%, alkaline activator sodium sulfate 15%, the sum of its raw materials is 100%;

所述改性粘土矿物按如下方法制备得到：按体积比1:0.9配制十六烷基三甲基溴化铵和十二烷基硫酸钠的混合溶液，以质量比9%加入到粘土矿物坡缕石中，在50℃下震荡8h后，过滤，洗涤，再过滤，于85℃下干燥72h，研磨，过200目筛。 The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:0.9, and add it to the clay mineral slope with a mass ratio of 9%. Shake at 50°C for 8 hours in the Gorgorite, filter, wash, filter again, dry at 85°C for 72 hours, grind, and pass through a 200-mesh sieve. the

应用试验例1 Application test example 1

“一种适用于重金属和半挥发性有机物复合污染土壤的稳定剂”在修复某化工厂污染土壤中的应用 Application of "a stabilizer suitable for heavy metal and semi-volatile organic compound compound polluted soil" in remediating polluted soil of a chemical plant

场地位于位于上海市浦东新区川沙新镇，占地11000平方米，原址为浦东某化工厂。根据场地内的监测数据，本场地土壤中的主要污染物为重金属（铜和锌）、多环芳烃（苯并(a)芘），挖掘前检出的最大值分别为：铜75.8mg/kg，锌284mg/kg，苯并（a）芘0.6mg/kg。 The site is located in Chuansha New Town, Pudong New District, Shanghai, covering an area of 11,000 square meters. The original site was a chemical factory in Pudong. According to the monitoring data in the site, the main pollutants in the soil of the site are heavy metals (copper and zinc), polycyclic aromatic hydrocarbons (benzo(a)pyrene), and the maximum values detected before excavation are: copper 75.8mg/kg , zinc 284mg/kg, benzo(a)pyrene 0.6mg/kg. the

利用专业的挖掘机对土壤进行挖掘，总共处理了25500方污染土壤，划分操作单元，将土壤临时堆存在场内，并在堆土区设立防渗层，利用环锤破碎机将土壤筛分、均匀分布在防渗层上，调节土壤含水率为20%左右。 The soil was excavated with a professional excavator, and a total of 25,500 square meters of contaminated soil was processed. The operation unit was divided, the soil was temporarily piled up in the site, and an anti-seepage layer was set up in the piled soil area, and the soil was screened, Evenly distributed on the anti-seepage layer, adjust the soil moisture content to about 20%. the

施用本发明实施例4所述的土壤稳定剂，将所述稳定剂中的胶凝材料、改性粘土矿物、碱性激发剂混合后研磨至勃氏比表面积5000～8000cm²/g，过200目筛，含水率小于3%；然后将混合研磨后的产品直接添加至重金属污染土壤中并混合搅拌，添加比例为土壤质量的12.5%；将所述稳定剂中占原料总和10%的重金属螯合剂配制成质量百分浓度为15%的溶液，然后将配制的重金属螯合剂溶液直接喷洒在重金属污染土壤中并混合搅拌。 Apply the soil stabilizer described in Example 4 of the present invention, mix the gelling material, modified clay mineral, and alkaline activator in the stabilizer, and then grind to a Blaine specific surface area of 5,000-8,000 cm² /g, over 200 Mesh sieve, moisture content is less than 3%; Then the product after mixing and grinding is directly added in the heavy metal polluted soil and mixes and stirs, and the addition ratio is 12.5% of soil mass; The mixture is prepared into a solution with a mass percentage concentration of 15%, and then the prepared heavy metal chelating agent solution is directly sprayed on the heavy metal polluted soil and mixed and stirred.

将稳定剂与土壤搅拌、充分混合后，养护5天以上，进行采样监测，监测结果和相应标准值的汇总见表1。 Stir and fully mix the stabilizer with the soil, then maintain for more than 5 days, and carry out sampling monitoring. The monitoring results and corresponding standard values are summarized in Table 1. the

表1土壤修复验收监测结果汇总表 Table 1 Summary of soil remediation acceptance monitoring results

从表1可以看出，稳定化处理后土壤的浸出液中，铜、锌和苯并(a)芘浓度的最大值均远远低于《地下水质量标准》（GB/T14848-93）的IV类标准值，以及荷兰DIV标准中地下水干预值。说明经过稳定化处理后，土壤中有害物质的浸出毒性得到很好的控制，达到了预期的修复效果和要求。 It can be seen from Table 1 that the maximum concentrations of copper, zinc and benzo(a)pyrene in the soil leachate after stabilization treatment are all far below the IV category of the "Groundwater Quality Standard" (GB/T14848-93) Standard value, and groundwater intervention value in Dutch DIV standard. It shows that after the stabilization treatment, the leaching toxicity of harmful substances in the soil has been well controlled, and the expected restoration effect and requirements have been achieved. the

应用试验例2 Application test example 2

在某污染场地施用本发明实施例3所述的土壤稳定剂，将所述稳定剂中的胶凝材料、改性粘土矿物、碱性激发剂混合后研磨至勃氏比表面积5000～8000cm²/g，过200目筛，含水率小于3%；然后将混合研磨后的产品直接添加至重金属污染土壤中并混合搅拌，添加比例为土壤质量的10%；将所述稳定剂中占原料总和8%的重金属螯合剂配制成质量百分浓度为10%的溶液，然后将配制的重金属螯合剂溶液直接喷洒在重金属污染土壤中并混合搅拌。 Apply the soil stabilizer described in Example 3 of the present invention on a certain polluted site, mix the gelling material, modified clay mineral, and alkaline activator in the stabilizer and grind until the Blaine specific surface area is 5000-8000 cm² / g, through a 200 mesh sieve, the moisture content is less than 3%; then the mixed and ground product is directly added to the heavy metal contaminated soil and mixed and stirred, the addition ratio is 10% of the soil quality; the stabilizer accounts for 8% of the total raw materials % of the heavy metal chelating agent was formulated into a solution with a concentration of 10% by mass, and then the prepared heavy metal chelating agent solution was directly sprayed on the heavy metal-contaminated soil and mixed and stirred.

施用土壤稳定剂，养护7天后，进行采样监测，土壤修复验收监测结果见下表： Apply soil stabilizer, after 7 days of curing, carry out sampling monitoring, soil restoration acceptance monitoring results are shown in the table below:

污染物Pollutants挖掘前检出最大值（mg/kg）The maximum value detected before excavation (mg/kg)修复后出液浓度（μg/L）Fluid concentration after repair (μg/L)锌zinc1771.51771.5未检出not detected镍nickel808.5808.5未检出not detected镉Cadmium99.199.1未检出not detected铬chrome1530.51530.5未检出not detected铜copper1208.51208.5未检出not detected苯并(a)芘Benzo(a)pyrene0.60.6未检出not detected总石油烃Total Petroleum Hydrocarbons3949.53949.5957957

应用试验例3 Application test example 3

在某污染场地施用本发明实施例1所述的土壤稳定剂，将所述稳定剂中的胶凝材料、改性粘土矿物、碱性激发剂混合后研磨至勃氏比表面积5000～8000cm²/g，过200目筛，含水率小于3%；然后将混合研磨后的产品直接添加至重金属污染土壤中并混合搅拌，添加比例为土壤质量的20%；将所述稳定剂中占原料总和5%的重金属螯合剂配制成质量百分浓度为20%的溶液，然后将配制的重金属螯合剂溶液直接喷洒在重金属污染土壤中并混合搅拌。 Apply the soil stabilizer described in Example 1 of the present invention to a polluted site, mix the gelling material, modified clay mineral, and alkaline activator in the stabilizer, and grind until the Blaine specific surface area is 5000-8000 cm² / g, through a 200 mesh sieve, the moisture content is less than 3%; then directly add the mixed and ground product to the heavy metal contaminated soil and mix and stir, the addition ratio is 20% of the soil quality; the stabilizer accounts for 5% of the total raw material % of the heavy metal chelating agent was formulated into a solution with a concentration of 20% by mass, and then the prepared heavy metal chelating agent solution was directly sprayed on the heavy metal-contaminated soil and mixed and stirred.

污染物Pollutants挖掘前检出最大值（mg/kg）The maximum value detected before excavation (mg/kg)修复后浸出液浓度（μg/L）Concentration of leachate after restoration (μg/L)砷arsenic122122未检出not detected镉Cadmium41.241.2未检出not detected铜copper116116未检出not detected汞HG10.010.0未检出not detected镍nickel7171未检出not detected锌zinc252252未检出not detected苯并(a)芘Benzo(a)pyrene2.52.5未检出not detected

Claims

1. a stablizer that is applicable to heavy metal and semi-volatile organic matter combined contamination soil, is characterized in that,

This stabilizer package contains the component of following mass ratio: heavy metal chelant 5%～10%, gelling material 10%～20%, modified clay mineral 55%～65%, alkali-activator 10%～15%, and its raw material summation is 100%;

Gelling material in said components, modified clay mineral, alkali-activator are ground to Blain specific surface 5000～8000cm after mixing²/ g, crosses 200 mesh sieves, and water ratio is less than 3%;

Described modified clay mineral is prepared as follows and obtains: the mixing solutions of 1:0.8 by volume～1:1.2 preparation cetyl trimethylammonium bromide and sodium lauryl sulphate, join in clay mineral with mass ratio 5%～10%, at 40 ℃～50 ℃, shake after 8h～10h, filter, washing, refilters, dry 48h～72h at 85 ℃～90 ℃, grind, cross 200 mesh sieves.

2. stablizer as claimed in claim 1, is characterized in that: described clay mineral is that one or more in zeolite, vermiculite, polygorskite, montmorillonite, kaolin are compound.

3. stablizer as claimed in claim 1 or 2, is characterized in that, the heavy metal chelant in described stablizer is that one or more in EDTA, Iron sulfuret, triazine trisodium salt are compound.

4. stablizer as claimed in claim 3, is characterized in that, the gelling material in described stablizer is that one or more in silicate, silico-aluminate, ferro-aluminate are compound.

5. stablizer as claimed in claim 4, is characterized in that, the alkali-activator in described stablizer is sodium sulfate.

6. a using method for the stablizer that is applicable to heavy metal and semi-volatile organic matter combined contamination soil as claimed in claim 1, is characterized in that,

Gelling material in described stablizer, modified clay mineral, alkali-activator mix and use, and using method is: will the gelling material in described stablizer, modified clay mineral, alkali-activator be ground to Blain specific surface 5000～8000cm after mixing²/ g, crosses 200 mesh sieves, and water ratio is less than 3%; Then the product after mixed grinding is added directly in heavy-metal contaminated soil and mix and blend, adding proportion is soil quality 10%～20%;

The heavy metal chelant that accounts for raw material summation 5%～10% in described stablizer uses separately, using method is: it is 10%～20% solution that the heavy metal chelant in described stablizer is mixed with to mass percentage concentration, then the heavy metal chelating agent solution of preparation is sprayed directly in heavy-metal contaminated soil and mix and blend.